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Band Structure and Topological Properties of Graphene in a Superlattice Spin Exchange Field

机译:超晶格中石墨烯的能带结构和拓扑性质   旋转交换场

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摘要

We analyze the energy spectrum of graphene in the presence of spin-orbitcoupling and a unidirectionally periodic Zeeman field, focusing on thestability and location of Dirac points it may support. It is found that theDirac points at the $K$ and $K'$ points are generically moved to otherlocations in the Brillouin zone, but that they remain present when the Zeemanfield $\vec{\Delta}(x)$ integrates to zero within a unit cell. A large varietyof locations for the Dirac points is shown to be possible: when $\vec\Delta\parallel \hat{z}$ they are shifted from their original locations along thedirection perpendicular to the superlattice axis, while realizations of$\vec\Delta(x)$ that rotate periodically move the Dirac points to locationsthat can reflect the orbit of the rotating electron spin as it moves through aunit cell. When a uniform Zeeman field is applied in addition to a periodic$\vec\Delta \parallel \hat{z}$ integrating to zero, the system can be broughtinto a metallic, Dirac semimetal, or insulating state, depending on thedirection of the uniform field. The latter is shown to be an anomalous quantumHall insulator.
机译:我们分析了自旋轨道耦合和单向周期性塞曼场存在下石墨烯的能谱,重点研究了其可能支持的狄拉克点的稳定性和位置。发现在$ K $和$ K'$点处的狄拉克点通常都移到了布里渊区中的其他位置,但是当Zeemanfield $ \ vec {\ Delta}(x)$积分为零时,它们仍然存在晶胞。 Dirac点的位置可能多种多样:当$ \ vec \ Delta \ parallel \ hat {z} $沿垂直于超晶格轴的方向从原始位置移动时,$ \ vec \的实现周期性旋转的Delta(x)$将狄拉克点移动到可以反映旋转的电子自旋通过单位晶胞时的轨道的位置。当除了均匀积分为零的\ vec \ Delta \ parallel \ hat {z} $外,还应用均匀的Zeeman场时,可以根据均匀的方向将系统带入金属,狄拉克半金属或绝缘状态领域。后者被证明是一个异常的量子霍尔绝缘体。

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